I'm from the US and I've never heard of any camper that can be stored on its side. You could try and find a used camper to buy, but why not rent one? https://www.cruiseamerica.com/ rents all sizes. My brother has rented from them. He and his family loved it. No issues with storing or repairs.
I watched to video for the camp-let and that seemed like a lot of work to setup. My family used to have pop-up trailers and they were pretty easy and quick to just pop-up and pull the beds out. The camp-let doesn't look like it would be good for North America. It's basically a big tent with your cooking grill inside which you dont want in bear country. That would make the whole inside smell like food and attract bears. Pop-up trailers are a little sturdier around and can even be hard sided so we didn't worry about bears when we used it. We were able to store ours for the winter on a friend's farm though. Also the bottom of the tent is open so ticks and mosquitoes coming from the grass seem like an issue unlike a full tent.
I think you would be better off just getting a pop up trailer if you can find somewhere to store it, or a fancy 2 room tent with cots and a separate BBQ that you can use outside away from the tent.
Here in Australia, the market is flooded with inexpensive Chinese-manufactured off-road camper trailers designed for open-living.
You can then mount your own choice of quality Roof-Top-Tent and awning for sleeping and shelter.
https://23zero.com.au/product/panther-2000/
https://23zero.com.au/product/falcon-270-awning/
https://www.4wdsupacentre.com.au/adventure-kings-mt2-base-trailer.html
camping
All things back-country camping! Gear discussions, destination talks and everything else within that realm